content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.flowable.processors;
  
  import static org.junit.Assert.*;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.util.List;
  import java.util.concurrent.*;
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.junit.*;
  import org.mockito.*;
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.common.*;
  import io.reactivex.common.exceptions.*;
  import io.reactivex.common.functions.Function;
  import io.reactivex.flowable.*;
  import io.reactivex.flowable.internal.subscriptions.BooleanSubscription;
  import io.reactivex.flowable.subscribers.*;
  
  public class BehaviorProcessorTest extends DelayedFlowableProcessorTest<Object> {
  
      private final Throwable testException = new Throwable();
  
      @Override
      protected FlowableProcessor<Object> create() {
          return BehaviorProcessor.create();
      }
  
      @Test
      public void testThatSubscriberReceivesDefaultValueAndSubsequentEvents() {
          BehaviorProcessor<String> subject = BehaviorProcessor.createDefault("default");
  
          Subscriber<String> observer = TestHelper.mockSubscriber();
          subject.subscribe(observer);
  
          subject.onNext("one");
          subject.onNext("two");
          subject.onNext("three");
  
          verify(observer, times(1)).onNext("default");
          verify(observer, times(1)).onNext("one");
          verify(observer, times(1)).onNext("two");
          verify(observer, times(1)).onNext("three");
          verify(observer, Mockito.never()).onError(testException);
          verify(observer, Mockito.never()).onComplete();
      }
  
      @Test
      public void testThatSubscriberReceivesLatestAndThenSubsequentEvents() {
          BehaviorProcessor<String> subject = BehaviorProcessor.createDefault("default");
  
          subject.onNext("one");
  
          Subscriber<String> observer = TestHelper.mockSubscriber();
          subject.subscribe(observer);
  
          subject.onNext("two");
          subject.onNext("three");
  
          verify(observer, Mockito.never()).onNext("default");
          verify(observer, times(1)).onNext("one");
          verify(observer, times(1)).onNext("two");
          verify(observer, times(1)).onNext("three");
          verify(observer, Mockito.never()).onError(testException);
          verify(observer, Mockito.never()).onComplete();
      }
  
      @Test
      public void testSubscribeThenOnComplete() {
          BehaviorProcessor<String> subject = BehaviorProcessor.createDefault("default");
  
          Subscriber<String> observer = TestHelper.mockSubscriber();
          subject.subscribe(observer);
  
          subject.onNext("one");
          subject.onComplete();
  
          verify(observer, times(1)).onNext("default");
          verify(observer, times(1)).onNext("one");
          verify(observer, Mockito.never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void testSubscribeToCompletedOnlyEmitsOnComplete() {
          BehaviorProcessor<String> subject = BehaviorProcessor.createDefault("default");
          subject.onNext("one");
          subject.onComplete();
  
          Subscriber<String> observer = TestHelper.mockSubscriber();
          subject.subscribe(observer);
  
          verify(observer, never()).onNext("default");
          verify(observer, never()).onNext("one");
          verify(observer, Mockito.never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void testSubscribeToErrorOnlyEmitsOnError() {
          BehaviorProcessor<String> subject = BehaviorProcessor.createDefault("default");
          subject.onNext("one");
          RuntimeException re = new RuntimeException("test error");
          subject.onError(re);
  
          Subscriber<String> observer = TestHelper.mockSubscriber();
          subject.subscribe(observer);
  
          verify(observer, never()).onNext("default");
          verify(observer, never()).onNext("one");
          verify(observer, times(1)).onError(re);
          verify(observer, never()).onComplete();
      }
  
      @Test
      public void testCompletedStopsEmittingData() {
          BehaviorProcessor<Integer> channel = BehaviorProcessor.createDefault(2013);
          Subscriber<Object> observerA = TestHelper.mockSubscriber();
          Subscriber<Object> observerB = TestHelper.mockSubscriber();
          Subscriber<Object> observerC = TestHelper.mockSubscriber();
  
          TestSubscriber<Object> ts = new TestSubscriber<Object>(observerA);
  
          channel.subscribe(ts);
          channel.subscribe(observerB);
  
          InOrder inOrderA = inOrder(observerA);
          InOrder inOrderB = inOrder(observerB);
          InOrder inOrderC = inOrder(observerC);
  
          inOrderA.verify(observerA).onNext(2013);
          inOrderB.verify(observerB).onNext(2013);
  
          channel.onNext(42);
  
          inOrderA.verify(observerA).onNext(42);
          inOrderB.verify(observerB).onNext(42);
  
          ts.dispose();
          inOrderA.verifyNoMoreInteractions();
  
          channel.onNext(4711);
  
          inOrderB.verify(observerB).onNext(4711);
  
          channel.onComplete();
  
          inOrderB.verify(observerB).onComplete();
  
          channel.subscribe(observerC);
  
          inOrderC.verify(observerC).onComplete();
  
          channel.onNext(13);
  
          inOrderB.verifyNoMoreInteractions();
          inOrderC.verifyNoMoreInteractions();
      }
  
      @Test
      public void testCompletedAfterErrorIsNotSent() {
          BehaviorProcessor<String> subject = BehaviorProcessor.createDefault("default");
  
          Subscriber<String> observer = TestHelper.mockSubscriber();
          subject.subscribe(observer);
  
          subject.onNext("one");
          subject.onError(testException);
          subject.onNext("two");
          subject.onComplete();
  
          verify(observer, times(1)).onNext("default");
          verify(observer, times(1)).onNext("one");
          verify(observer, times(1)).onError(testException);
          verify(observer, never()).onNext("two");
          verify(observer, never()).onComplete();
      }
  
      @Test
      public void testCompletedAfterErrorIsNotSent2() {
          BehaviorProcessor<String> subject = BehaviorProcessor.createDefault("default");
  
          Subscriber<String> observer = TestHelper.mockSubscriber();
          subject.subscribe(observer);
  
          subject.onNext("one");
          subject.onError(testException);
          subject.onNext("two");
          subject.onComplete();
  
          verify(observer, times(1)).onNext("default");
          verify(observer, times(1)).onNext("one");
          verify(observer, times(1)).onError(testException);
          verify(observer, never()).onNext("two");
          verify(observer, never()).onComplete();
  
          Subscriber<Object> o2 = TestHelper.mockSubscriber();
          subject.subscribe(o2);
          verify(o2, times(1)).onError(testException);
          verify(o2, never()).onNext(any());
          verify(o2, never()).onComplete();
      }
  
      @Test
      public void testCompletedAfterErrorIsNotSent3() {
          BehaviorProcessor<String> subject = BehaviorProcessor.createDefault("default");
  
          Subscriber<String> observer = TestHelper.mockSubscriber();
          subject.subscribe(observer);
  
          subject.onNext("one");
          subject.onComplete();
          subject.onNext("two");
          subject.onComplete();
  
          verify(observer, times(1)).onNext("default");
          verify(observer, times(1)).onNext("one");
          verify(observer, times(1)).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, never()).onNext("two");
  
          Subscriber<Object> o2 = TestHelper.mockSubscriber();
          subject.subscribe(o2);
          verify(o2, times(1)).onComplete();
          verify(o2, never()).onNext(any());
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test(timeout = 1000)
      public void testUnsubscriptionCase() {
          BehaviorProcessor<String> src = BehaviorProcessor.createDefault("null"); // FIXME was plain null which is not allowed
  
          for (int i = 0; i < 10; i++) {
              final Subscriber<Object> o = TestHelper.mockSubscriber();
              InOrder inOrder = inOrder(o);
              String v = "" + i;
              src.onNext(v);
              System.out.printf("Turn: %d%n", i);
              src.firstElement()
                  .flatMap(new Function<String, Flowable<String>>() {
  
                      @Override
                      public Flowable<String> apply(String t1) {
                          return Flowable.just(t1 + ", " + t1);
                      }
                  })
                  .subscribe(new DefaultSubscriber<String>() {
                      @Override
                      public void onNext(String t) {
                          o.onNext(t);
                      }
  
                      @Override
                      public void onError(Throwable e) {
                          o.onError(e);
                      }
  
                      @Override
                      public void onComplete() {
                          o.onComplete();
                      }
                  });
              inOrder.verify(o).onNext(v + ", " + v);
              inOrder.verify(o).onComplete();
              verify(o, never()).onError(any(Throwable.class));
          }
      }
      @Test
      public void testStartEmpty() {
          BehaviorProcessor<Integer> source = BehaviorProcessor.create();
          final Subscriber<Object> o = TestHelper.mockSubscriber();
          InOrder inOrder = inOrder(o);
  
          source.subscribe(o);
  
          inOrder.verify(o, never()).onNext(any());
          inOrder.verify(o, never()).onComplete();
  
          source.onNext(1);
  
          source.onComplete();
  
          source.onNext(2);
  
          verify(o, never()).onError(any(Throwable.class));
  
          inOrder.verify(o).onNext(1);
          inOrder.verify(o).onComplete();
          inOrder.verifyNoMoreInteractions();
  
  
      }
      @Test
      public void testStartEmptyThenAddOne() {
          BehaviorProcessor<Integer> source = BehaviorProcessor.create();
          final Subscriber<Object> o = TestHelper.mockSubscriber();
          InOrder inOrder = inOrder(o);
  
          source.onNext(1);
  
          source.subscribe(o);
  
          inOrder.verify(o).onNext(1);
  
          source.onComplete();
  
          source.onNext(2);
  
          inOrder.verify(o).onComplete();
          inOrder.verifyNoMoreInteractions();
  
          verify(o, never()).onError(any(Throwable.class));
  
      }
      @Test
      public void testStartEmptyCompleteWithOne() {
          BehaviorProcessor<Integer> source = BehaviorProcessor.create();
          final Subscriber<Object> o = TestHelper.mockSubscriber();
  
          source.onNext(1);
          source.onComplete();
  
          source.onNext(2);
  
          source.subscribe(o);
  
          verify(o).onComplete();
          verify(o, never()).onError(any(Throwable.class));
          verify(o, never()).onNext(any());
      }
  
      @Test
      public void testTakeOneSubscriber() {
          BehaviorProcessor<Integer> source = BehaviorProcessor.createDefault(1);
          final Subscriber<Object> o = TestHelper.mockSubscriber();
  
          source.take(1).subscribe(o);
  
          verify(o).onNext(1);
          verify(o).onComplete();
          verify(o, never()).onError(any(Throwable.class));
  
          assertEquals(0, source.subscriberCount());
          assertFalse(source.hasSubscribers());
      }
  
      // FIXME RS subscribers are not allowed to throw
  //    @Test
  //    public void testOnErrorThrowsDoesntPreventDelivery() {
  //        BehaviorSubject<String> ps = BehaviorSubject.create();
  //
  //        ps.subscribe();
  //        TestSubscriber<String> ts = new TestSubscriber<String>();
  //        ps.subscribe(ts);
  //
  //        try {
  //            ps.onError(new RuntimeException("an exception"));
  //            fail("expect OnErrorNotImplementedException");
  //        } catch (OnErrorNotImplementedException e) {
  //            // ignore
  //        }
  //        // even though the onError above throws we should still receive it on the other subscriber
  //        assertEquals(1, ts.getOnErrorEvents().size());
  //    }
  
      // FIXME RS subscribers are not allowed to throw
  //    /**
  //     * This one has multiple failures so should get a CompositeException
  //     */
  //    @Test
  //    public void testOnErrorThrowsDoesntPreventDelivery2() {
  //        BehaviorSubject<String> ps = BehaviorSubject.create();
  //
  //        ps.subscribe();
  //        ps.subscribe();
  //        TestSubscriber<String> ts = new TestSubscriber<String>();
  //        ps.subscribe(ts);
  //        ps.subscribe();
  //        ps.subscribe();
  //        ps.subscribe();
  //
  //        try {
  //            ps.onError(new RuntimeException("an exception"));
  //            fail("expect OnErrorNotImplementedException");
  //        } catch (CompositeException e) {
  //            // we should have 5 of them
  //            assertEquals(5, e.getExceptions().size());
  //        }
  //        // even though the onError above throws we should still receive it on the other subscriber
  //        assertEquals(1, ts.getOnErrorEvents().size());
  //    }
      @Test
      public void testEmissionSubscriptionRace() throws Exception {
          Scheduler s = Schedulers.io();
          Scheduler.Worker worker = Schedulers.io().createWorker();
          try {
              for (int i = 0; i < 50000; i++) {
                  if (i % 1000 == 0) {
                      System.out.println(i);
                  }
                  final BehaviorProcessor<Object> rs = BehaviorProcessor.create();
  
                  final CountDownLatch finish = new CountDownLatch(1);
                  final CountDownLatch start = new CountDownLatch(1);
  
                  worker.schedule(new Runnable() {
                      @Override
                      public void run() {
                          try {
                              start.await();
                          } catch (Exception e1) {
                              e1.printStackTrace();
                          }
                          rs.onNext(1);
                      }
                  });
  
                  final AtomicReference<Object> o = new AtomicReference<Object>();
  
                  rs.subscribeOn(s).observeOn(Schedulers.io())
                  .subscribe(new DefaultSubscriber<Object>() {
  
                      @Override
                      public void onComplete() {
                          o.set(-1);
                          finish.countDown();
                      }
  
                      @Override
                      public void onError(Throwable e) {
                          o.set(e);
                          finish.countDown();
                      }
  
                      @Override
                      public void onNext(Object t) {
                          o.set(t);
                          finish.countDown();
                      }
  
                  });
                  start.countDown();
  
                  if (!finish.await(5, TimeUnit.SECONDS)) {
                      System.out.println(o.get());
                      System.out.println(rs.hasSubscribers());
                      rs.onComplete();
                      Assert.fail("Timeout @ " + i);
                      break;
                  } else {
                      Assert.assertEquals(1, o.get());
                      worker.schedule(new Runnable() {
                          @Override
                          public void run() {
                              rs.onComplete();
                          }
                      });
                  }
              }
          } finally {
              worker.dispose();
          }
      }
  
      @Test
      public void testCurrentStateMethodsNormalEmptyStart() {
          BehaviorProcessor<Object> as = BehaviorProcessor.create();
  
          assertFalse(as.hasValue());
          assertFalse(as.hasThrowable());
          assertFalse(as.hasComplete());
          assertNull(as.getValue());
          assertNull(as.getThrowable());
  
          as.onNext(1);
  
          assertTrue(as.hasValue());
          assertFalse(as.hasThrowable());
          assertFalse(as.hasComplete());
          assertEquals(1, as.getValue());
          assertNull(as.getThrowable());
  
          as.onComplete();
  
          assertFalse(as.hasValue());
          assertFalse(as.hasThrowable());
          assertTrue(as.hasComplete());
          assertNull(as.getValue());
          assertNull(as.getThrowable());
      }
  
      @Test
      public void testCurrentStateMethodsNormalSomeStart() {
          BehaviorProcessor<Object> as = BehaviorProcessor.createDefault((Object)1);
  
          assertTrue(as.hasValue());
          assertFalse(as.hasThrowable());
          assertFalse(as.hasComplete());
          assertEquals(1, as.getValue());
          assertNull(as.getThrowable());
  
          as.onNext(2);
  
          assertTrue(as.hasValue());
          assertFalse(as.hasThrowable());
          assertFalse(as.hasComplete());
          assertEquals(2, as.getValue());
          assertNull(as.getThrowable());
  
          as.onComplete();
          assertFalse(as.hasValue());
          assertFalse(as.hasThrowable());
          assertTrue(as.hasComplete());
          assertNull(as.getValue());
          assertNull(as.getThrowable());
      }
  
      @Test
      public void testCurrentStateMethodsEmpty() {
          BehaviorProcessor<Object> as = BehaviorProcessor.create();
  
          assertFalse(as.hasValue());
          assertFalse(as.hasThrowable());
          assertFalse(as.hasComplete());
          assertNull(as.getValue());
          assertNull(as.getThrowable());
  
          as.onComplete();
  
          assertFalse(as.hasValue());
          assertFalse(as.hasThrowable());
          assertTrue(as.hasComplete());
          assertNull(as.getValue());
          assertNull(as.getThrowable());
      }
      @Test
      public void testCurrentStateMethodsError() {
          BehaviorProcessor<Object> as = BehaviorProcessor.create();
  
          assertFalse(as.hasValue());
          assertFalse(as.hasThrowable());
          assertFalse(as.hasComplete());
          assertNull(as.getValue());
          assertNull(as.getThrowable());
  
          as.onError(new TestException());
  
          assertFalse(as.hasValue());
          assertTrue(as.hasThrowable());
          assertFalse(as.hasComplete());
          assertNull(as.getValue());
          assertTrue(as.getThrowable() instanceof TestException);
      }
  
      @Test
      public void cancelOnArrival() {
          BehaviorProcessor<Object> p = BehaviorProcessor.create();
  
          assertFalse(p.hasSubscribers());
  
          p.test(0L, true).assertEmpty();
  
          assertFalse(p.hasSubscribers());
      }
  
      @Test
      public void onSubscribe() {
          BehaviorProcessor<Object> p = BehaviorProcessor.create();
  
          BooleanSubscription bs = new BooleanSubscription();
  
          p.onSubscribe(bs);
  
          assertFalse(bs.isCancelled());
  
          p.onComplete();
  
          bs = new BooleanSubscription();
  
          p.onSubscribe(bs);
  
          assertTrue(bs.isCancelled());
      }
  
      @Test
      public void onErrorAfterComplete() {
          BehaviorProcessor<Object> p = BehaviorProcessor.create();
  
          p.onComplete();
  
          List<Throwable> errors = TestCommonHelper.trackPluginErrors();
          try {
              p.onError(new TestException());
  
              TestCommonHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaCommonPlugins.reset();
          }
      }
  
      @Test
      public void cancelOnArrival2() {
          BehaviorProcessor<Object> p = BehaviorProcessor.create();
  
          TestSubscriber<Object> ts = p.test();
  
          p.test(0L, true).assertEmpty();
  
          p.onNext(1);
          p.onComplete();
  
          ts.assertResult(1);
      }
  
      @Test
      public void addRemoveRace() {
          for (int i = 0; i < 500; i++) {
              final BehaviorProcessor<Object> p = BehaviorProcessor.create();
  
              final TestSubscriber<Object> ts = p.test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      p.test();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ts.cancel();
                  }
              };
  
              TestCommonHelper.race(r1, r2, Schedulers.single());
          }
      }
  
      @SuppressWarnings({ "rawtypes", "unchecked" })
      @Test
      public void subscribeOnNextRace() {
          for (int i = 0; i < 500; i++) {
              final BehaviorProcessor<Object> p = BehaviorProcessor.createDefault((Object)1);
  
              final TestSubscriber[] ts = { null };
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ts[0] = p.test();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      p.onNext(2);
                  }
              };
  
              TestCommonHelper.race(r1, r2, Schedulers.single());
  
              if (ts[0].valueCount() == 1) {
                  ts[0].assertValue(2).assertNoErrors().assertNotComplete();
              } else {
                  ts[0].assertValues(1, 2).assertNoErrors().assertNotComplete();
              }
          }
      }
  
      @Test
      public void firstBackpressured() {
          BehaviorProcessor<Object> p = BehaviorProcessor.createDefault((Object)1);
  
          p.test(0L, false).assertFailure(MissingBackpressureException.class);
  
          assertFalse(p.hasSubscribers());
      }
  
      @Test
      public void offer() {
          BehaviorProcessor<Integer> pp = BehaviorProcessor.create();
  
          TestSubscriber<Integer> ts = pp.test(0);
  
          assertFalse(pp.offer(1));
  
          ts.request(1);
  
          assertTrue(pp.offer(1));
  
          assertFalse(pp.offer(2));
  
          ts.cancel();
  
          assertTrue(pp.offer(2));
  
          ts = pp.test(1);
  
          assertTrue(pp.offer(null));
  
          ts.assertFailure(NullPointerException.class, 2);
  
          assertTrue(pp.hasThrowable());
          assertTrue(pp.getThrowable().toString(), pp.getThrowable() instanceof NullPointerException);
      }
  
      @Test
      public void offerAsync() throws Exception {
          final BehaviorProcessor<Integer> pp = BehaviorProcessor.create();
  
          Schedulers.single().scheduleDirect(new Runnable() {
              @Override
              public void run() {
                  while (!pp.hasSubscribers()) {
                      try {
                          Thread.sleep(1);
                      } catch (InterruptedException ex) {
                          return;
                      }
                  }
  
                  for (int i = 1; i <= 10; i++) {
                      while (!pp.offer(i)) { }
                  }
                  pp.onComplete();
              }
          });
  
          Thread.sleep(1);
  
          pp.test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
      }
  
      @Test
      public void completeSubscribeRace() throws Exception {
          for (int i = 0; i < 1000; i++) {
              final BehaviorProcessor<Object> p = BehaviorProcessor.create();
  
              final TestSubscriber<Object> ts = new TestSubscriber<Object>();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      p.subscribe(ts);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      p.onComplete();
                  }
              };
  
              TestCommonHelper.race(r1, r2);
  
              ts.assertResult();
          }
      }
  
      @Test
      public void errorSubscribeRace() throws Exception {
          for (int i = 0; i < 1000; i++) {
              final BehaviorProcessor<Object> p = BehaviorProcessor.create();
  
              final TestSubscriber<Object> ts = new TestSubscriber<Object>();
  
              final TestException ex = new TestException();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      p.subscribe(ts);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      p.onError(ex);
                  }
              };
  
              TestCommonHelper.race(r1, r2);
  
              ts.assertFailure(TestException.class);
          }
      }
  }
  